Project Management...Dr. Wallmüller, Project Management, Spring 2006 11 Concept Exploration •...
Transcript of Project Management...Dr. Wallmüller, Project Management, Spring 2006 11 Concept Exploration •...
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Dr. Wallmüller, Project Management, Spring 2006 1
Project Management
Session 3: Planning
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Content
• 1. Phases in Detail – Step-by-step of typical software project
• 2. Lifecycle Planning • 3. Project plans • Next Week: Lots of Project-ish Details: WBS,
PERT, CPM, Scheduling & Estimation
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Session 2 Review
• PMI Fundamentals • PMI Processes • Project Organization
– Functional, Project, Matrix Orgs. • Initial documents
– Statement of Work (SOW) – Project Charter
• Readings
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Project Phases
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Time Allocation by Phase • Remember the 40-20-40 Rule
• Specification-Implementation-Test
40% 20% 40% Defense Systems
40% 25% 35% Real-time Systems
30% 15% 55% Internet Systems
35% 40% 25% Commercial DP
Integration & Test
Code & Unit Test
Planning
Bennatan, E.M, “On Time Within Budget”
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Time Allocation by Phase
15% 10% System test
20% 15% Integration
5% 20% Unit Test
10% 25% Code
20% 20% Design
30% 10% Analysis
Large Project (500K LOC)
Small Project (2.5K LOC)
Activity
McConnell, Steve, “Rapid Development”
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Activities by % of Total Effort
NASA’s “Manager’s Handbook for Software Development”
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Potential Deliverables by Phase
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Concept Exploration
• The “Why” phase • Not a “mandatory formal” phase
– Sometimes called the “pre-project” phase • Collecting project ideas
– Then the “funneling” process • Project Justification
– ROI – Cost-benefit analysis – Project Portfolio Matrix
• Initial planning and estimates
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Concept Exploration
• Possibly includes Procurement Management: • RFP Process • Vendor selection • Contract management
• Gathering the initial team – Including PM if not already on-board
• Identify the project sponsor – Primary contact for approval and decision making
• Potential Phase Outputs: – Concept Document, Product Description, Proposal,
SOW, Project Charter
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Concept Exploration
• Characteristics & Issues – Lack of full commitment and leadership – Some frustrations:
• Management only getting rough estimates from development • Development not getting enough specifics from customer • Finding a balanced team
– Budget sign-off may be your 1st major task – Achieved via:
• Good concept document or equivalent • Demonstration of clear need (justification) • Initial estimates
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Requirements
• The “What” phase • Inputs: SOW, Proposal • Outputs:
– Requirements Document (RD) • a.k.a.Requirements Specification Document (RSD) • Software Requirements Specification (SRS)
– 1st Project Baseline – Software Project Management Plan (SPMP) – Requirements Approval & Sign-Off
• Your most difficult task in this phase
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Requirements
• Perhaps most important & difficult phase • Shortchanging it is a ‘classic mistake’ • Can begin with a Project Kickoff Meeting • Can end with a Software Requirements
Review (SRR) – For Sponsor and/or customer(s) approval
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Why are Requirements so Important?
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Requirements
• Characteristics & Issues – Conflict of interest: developer vs. customer – Potential tug-of-war:
• Disagreement on Features & Estimates • Especially in fixed-price contracts
– Frequent requirements changes – Achieving sign-off
• Project planning occurs in parallel
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Requirements
• Requirements are capabilities and condition to which the system – more broadly, the project – must conform
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2 Types of Requirements – Functional (behavioral)
– Features and capabilities
– Non-functional (a.k.a. “technical”) (everything else) – Usability
» Human factors, help, documentation – Reliability
» Failure rates, recoverability, availability – Performance
» Response times, throughput, resource usage – Supportability
» Maintainability, internationalization – Operations: systems management, installation – Interface: integration with other systems – Other: legal, packaging, hardware
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Requirements
• Other ways of categorizing – Go-Ahead vs. Catch-up
• Relative to competition – Backward-looking vs. Forward-looking
• Backward: address issues with previous version • Forward: Anticipating future needs of customers
• Must be prioritized • Must-have • Should-have • Could-have (Nice-to-have: NTH)
• Must be approved
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Early Phase Meetings
• Project Kickoff Meeting • Project Brainstorming Meeting
– Clarify goals, scope, assumptions – Refine estimates
• WBS Meeting
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Analysis & Design
• The “How” Phases • Inputs: Requirements Document • Outputs:
– Functional Specification – Detailed Design Document – User Interface Specification – Data Model – Prototype (can also be done with requirements) – Updated Plan (improved estimates; new baseline)
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Analysis & Design
• a.k.a. Top-level design & detailed design • Continues process from RD • Ends with Critical Design Review (CDR)
– Formal sign-off – Can also include earlier Preliminary Design
Review (PDR) for high level design
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Analysis & Design
• Characteristics & Issues – Enthusiasm via momentum – Team structure and assignments finalized – Delays due to requirements changes, new
information or late ideas – Issues around personnel responsibilities – Unfeasible requirements (technical complexity) – Resource Issues
• Including inter-project contention
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Development
• The “Do It” phase • Coding & Unit testing • Often overlaps Design & Integration phases
– To shorten the overall schedule – PM needs to coordinate this
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Development
• Other concurrent activities – Design completion – Integration begins – Unit testing of individual components – Test bed setup (environment and tools) – Project plans updated – Scope and Risk Management conducted
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Development
• Characteristics – Pressure increases – Staffing at highest levels – Often a “heads-down” operation
• Issues – Last-minute changes – Team coordination (esp. in large projects) – Communication overhead – Management of sub-contractors
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Integration & Test
• Evolves from Dev. Phase • Often done as 2 parallel phases
– Partial integration & initial test • Starts with integration of modules • An initial, incomplete version constructed • Progressively add more components
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Integration & Test
• Integration primarily a programmer task • Test primarily a QA team task • Integration:
– Top-down: Core functionality first, empty shells for incomplete routines (stubs)
– Bottom up: gradually bind low-level modules – Prefer top-down generally
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Integration & Test
• Tests – Integration testing – Black & White-box testing – Load & Stress testing – Alpha & Beta testing – Acceptance testing
• Other activities – Final budgeting; risk mgmt.; training;
installation preparation; team reduced
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Integration & Test
• Characteristics & Issues – Increased pressure – Overtime – Customer conflicts over features – Frustration over last-minute failures – Budget overruns – Motivation problems (such as burnout) – Difficulty in customer acceptance
• Esp. true for fixed-price contracts
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Deployment & Maintenance
• Installation depends on system type – Web-based, CD-ROM, in-house, etc.
• Migration strategy • How to get customers up on the system
– Parallel operation • Deployment typically in your project plan,
maintenance not
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Deployment & Maintenance
• Maintenance – Fix defects – Add new features – Improve performance
• Configuration control is very important here • Documents need to be maintained also • Sometimes a single team maintains multiple
products
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Deployment & Maintenance
• Characteristics & Issues – Lack of enthusiasm – Pressure for quick fixes – Insufficient budget – Too many patches – Personnel turnover – Regression testing is critical
• Preferably through automated tools
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Lifecycle Planning
• a.k.a. Lifecycle Management or SDLC • Greatly influences your chance of success • Not choosing a lifecycle is a bad option • Three primary lifecycle model components
– Phases and their order – Intermediate products of each phase – Reviews used in each phase
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Lifecycle Planning
• Different projects require different approaches • You do not need to know all models by name • You should know how that if given a certain
scenario what sort of SDLC would be appropriate • There are more than covered here • A lifecycle is not a design, modeling or
diagramming technique – The same technique (UML, DFD, etc) can be used with
multiple lifecycles
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Pure Waterfall
• The “granddaddy” of models • Linear sequence of phases
– “Pure” model: no phases overlap • Document driven • All planning done up-front
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Waterfall Risk
• Why does the waterfall model “invite risk”? • Integration and testing occur at the end
– Often anyone’s 1st chance to “see” the program
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Pure Waterfall
• Works well for projects with – Stable product definition – Well-understood technologies – Quality constraints stronger than cost &
schedule – Technically weak staff
• Provides structure • Good for overseas projects
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Pure Waterfall
• Disadvantages – Not flexible
• Rigid march from start->finish
– Difficult to fully define requirements up front – Can produce excessive documentation – Few visible signs of progress until the end
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Code-and-Fix
• “Code-like-Hell” • Specification (maybe), Code (yes), Release
(maybe) • Advantages
– No overhead – Requires little expertise
• Disadvantages – No process, quality control, etc. – Highly risky
• Suitable for prototypes or throwaways
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Spiral
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Spiral
• Emphasizes risk analysis & mgmt. in each phase • A Series of Mini-projects • Each addresses a set of “risks”
– Start small, explore risks, prototype, plan, repeat
• Early iterations are “cheapest” • Number of spirals is variable
– Last set of steps are waterfall-like
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Spiral
• Advantages – Can be combined with other models – As costs increase, risks decrease – Risk orientation provides early warning
• Disadvantages – More complex – Requires more management
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Modified Waterfall – Sashimi
• Overlapping phases • Advantages
– Reduces overall schedule – Reduces documentation – Works well if personnel continuity
• Disadvantages – Milestones more ambiguous – Progress tracking more difficult – Communication can be more difficult
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Evolutionary Prototyping
• Design most prominent parts first – Usually via a visual prototype
• Good for situations with: – Rapidly changing requirements – Non-committal customer – Vague problem domain
• Provides steady, visible progress • Disadvantages
– Time estimation is difficult – Project completion date may be unknown – An excuse to do “code-and-fix”
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Staged Delivery • Waterfall steps through architectural design • Then detailed design, code, test, deliver in stages • Advantages
• Customers get product much sooner • Tangible signs of progress sooner • Problems discovered earlier • Increases flexibility • Reduces: status reporting overhead & estimation error
• Disadvantages • Requires more planning (for you the PM) • More releases increase effort (and possible feature creep)
• How’s this differ from Evolutionary Prototyping?
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V Process Model
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V Process Model
• Designed for testability – Emphasizes Verification & Validation
• Variation of waterfall • Strengths
– Encourages V&V at all phases • Weaknesses
– Does not handle iterations – Changes can be more difficult to handle
• Good choice for systems that require high reliability such as patient control systems
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RAD
• Rapid Application Development • Popular in the 80’s
– 1. Joint Requirements Planning (JRP) – 2. Joint Application Design (JAD) – 3. Construction
• Heavy use of tools: code generators • Time-boxed; many prototypes
– 4. Cutover • Good for systems with extensive user input
available
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COTS
• Commercial Off-The-Shelf software • Build-vs.-buy decision • Advantages
– Available immediately – Potentially lower cost
• Disadvantages – Not as tailored to your requirements
• Remember: custom software rarely meets its ideal (so compare that reality to COTS option)
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XP: eXtreme Programming
• Not a Microsoft product • Part of movement called “Agile
Development” • A “Lightweight” methodology • A bit counter-culture • Currently in vogue • Motto: “Embrace Change” • Highly Incremental / Iterative
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eXtreme Programming
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eXtreme Programming
• Suitable for small groups • Attempts to minimize unnecessary work • Uses an “on-site” customer • Small releases • Pair programming • Refactoring • Stories as requirements • You want good developers if you use this
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Other “Agile” Methodologies
• Agile here means “lite”, reduced docs, highly iterative
• Agile Software Development – Alliance , their “manifesto”, their book
• SCRUM – Features 30-day “Sprint” cycles
• Feature Driven Development (FDD) – XP with more emphasis on docs and process
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Other “Agile” Methodologies
• Adaptive Software Development (ASD) – Book, site
• Dynamic System Development Method (DSDM) – Popular in Europe
• Homegrown: developers often hide their “agile adventures” from management
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Other “Agile” Methodologies
• Pros – Similar to XP, can reduce process overhead – Responsive to user feedback – Amenable to change
• Cons – Requires close monitoring by PM – May not “scale” to large projects – Often requires better quality developers
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Rational Unified Process
• RUP • From Rational Corporation • “Generic” version is the Unified Process • Commercial • Extensive tool support (expensive) • Object-oriented • Incremental • Newer
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Rational Unified Process
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Rational Unified Process
• Develop Iteratively • Manage Requirements • Uses UML (Unified Modeling Language) • Produces “artifacts” • Use component-based architecture • Visually model software • Complex process • A “framework” • Suitable for large scale systems
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Choosing Your Lifecycle
• Varies by project • Opt for “iterative” or “incremental” • How well are requirements understood? • What are the risks? • Is there a fixed deadline? • How experienced is the team or customer? • See the table in McConnell
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IEEE 1074
• A standard for developing software processes – Lifecycle model selection – Project management process – Predevelopment processes – Development processes – Post-development processes – Integral process
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Planning
• “Plans are nothing. But planning is everything.” Gen. Dwight Eisenhower
• “Aktualisieren” • “Nachführen/Versionieren” • “Kommunizieren/Verteilen”
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Planning
• Preliminary planning starts on day one • Even in the pre-project phase • Should not be conducted “in secret” • Need buy-in and approval
– Very important step – Both from above and below
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Your PM Process
• Why • Deliverable: ROI
• What • SOW, Requirements
• How • Design Specification, SDP, Lifecycle
• Do • Execution
• Done • PPR
Futrell, Shafer, Shafer, “Quality Software Project Management”
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Primary Planning Steps
• Identify project scope and objectives • Identify project organizational environment • Analyze project characteristics • Identify project products and activities • Estimate effort for each activity • Identify risk • Allocate resources • Review and communicate plan
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Planning Documents
• Software Development Plan (SDP) • Software Quality Assurance Plan (SQAP) • Software Configuration Management Plan
(SCMP) • Risk Management Plan • Software Process Improvement Plan • Communications Management Plan • Migration Plan • Operations Plan
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Planning Documents
• You (the PM) need to choose which documents are appropriate
• Docs do not have to be lengthy • Small Set:
– Software Development Plan – Risk Management Plan – Software Quality Assurance Plan – Software Configuration Management Plan
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Planning Documents
• Project ROI Analysis • Statement of Work (SOW) • Project Charter • Software Project Management Plan (SPMP) • Budget • Responsibility Assignment Matrix (RAM) • Risk Management Plan
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Product Documents
• Statement of Need • System Interface
Specification • Software Requirements
Specification • Software Design
Specification • Software Validation &
Verification Plan • User Documentation
• Support Plan • Maintenance
Documentation
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Planning
• How much will it cost? • How long will it take? • How many people will it take? • What might go wrong?
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Planning
• Scoping • Estimation • Risk • Schedule • Control Strategy
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Process Issues
• You want a fairly sophisticated process without incurring much overhead
• Remember, projects are often larger than they first appear
• Easier to loosen too much process than add later
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Plans Evolve Over Time
NASA’s “Manager’s Handbook for Software Development”
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Software Development Plan
• Software Project Management Plan (SPMP) • Some consider it the most important
document in the project (along with SRS) – Can be seen as an aggregation of other core
documents • Evolves over time as pieces come together • McConnell’s example
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SDP / SPMP
• Fundamental Sections – Project overview – Deliverables – Project organization – Managerial processes – Technical processes – Budget – Schedule
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Communications Management Plan
• Often a section of SPMP • Describes information flow to all parties
– Gathering and distributing information • Status meetings
– Monthly, Weekly, Daily? – Status reports are vital
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Questions?